Question: What empire starts with the letter m?
Paraphrase: What realm begins with the letter m?
SPARQL (Wikidata): SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q48349 . ?sbj rdfs:label ?sbj_label . FILTER(STRSTARTS(lcase(?sbj_label), 'm')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 
Answer: Mesopotamian kingdoms, Mesopotamian kingdoms, Macedonia, Macedonia, Maurya Empire, Maurya Empire, Mongol Empire, Mongol Empire, Mughal Empire, Mughal Empire